The vast bulk of the Fannie Mae and Freddie Mac balance sheet consisted of top-quality conforming mortgages. If they had had conventional balance sheets, they ought to have been able to ride out the storm. The problem was they did not. In June 2008 Fannie Mae and Freddie Mac held MBS valued at $1.8 trillion and guaranteed another $3.7 trillion on the basis of shareholder equity, which in the case of Fannie Mae came to only $41.2 billion, and in the case of Freddie Mac, to $12.9 billion.
